CN114442280A - Imaging lens group - Google Patents

Abstract

The invention provides an imaging lens group. The light-emitting side of the imaging lens group from the light-in side of the imaging lens group comprises: the surface of the first lens facing the light inlet side is a concave surface, and the surface of the first lens facing the light outlet side is a concave surface; a second lens having an optical power, the second lens having an Abbe number of less than 20; the surface of the third lens facing the light incidence side is a convex surface; the surface of the fourth lens facing the light incidence side is a concave surface; a fifth lens having optical power; a sixth lens having optical power; wherein the maximum field angle FOV of the imaging lens group satisfies: FOV > 80. The invention solves the problem that the imaging lens group in the prior art cannot give consideration to high image quality and miniaturization.

Description

Imaging lens group

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an imaging lens group.

Background

With the development of society, electronic products such as mobile phones and flat panels have become indispensable tools in people's lives, and in order to be adaptable to these electronic products, while ensuring the imaging quality, the imaging lens group gradually develops toward miniaturization and lightness, thereby causing design difficulty. In addition to this, the performance improvement and size reduction of the image sensor also require the development of the imaging lens group toward miniaturization.

That is to say, the imaging lens group in the prior art has the problem that the high image quality and the miniaturization can not be compatible.

Disclosure of Invention

The invention mainly aims to provide an imaging lens group to solve the problem that the imaging lens group in the prior art cannot give consideration to high image quality and miniaturization.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens group, comprising from a light-in side of the imaging lens group to a light-out side of the imaging lens group: the surface of the first lens facing the light inlet side is a concave surface, and the surface of the first lens facing the light outlet side is a concave surface; a second lens having an optical power, the second lens having an Abbe number of less than 20; the surface of the third lens facing the light incidence side is a convex surface; the surface of the fourth lens facing the light incidence side is a concave surface; a fifth lens having optical power; a sixth lens having optical power; wherein the maximum field angle FOV of the imaging lens group satisfies: FOV > 80.

Further, the effective focal length f of the imaging lens group and the effective focal length f3 of the third lens satisfy: f3/f is more than 1.5 and less than 5.0.

Further, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0.

Further, the curvature radius R3 of the surface of the second lens facing the light inlet side and the curvature radius R11 of the surface of the sixth lens facing the light inlet side satisfy that: -1.5 < R3/R11 < 0.5.

Further, the curvature radius R3 of the surface of the second lens facing the light inlet side and the curvature radius R12 of the surface of the sixth lens facing the light outlet side satisfy that: -0.5 < R3/R12 < 1.5.

Further, the radius of curvature R6 of the surface of the third lens facing the light-exit side and the radius of curvature R10 of the surface of the fifth lens facing the light-exit side satisfy: 1.5 < R6/R10 < 7.5.

Further, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0.

Further, the center thickness CT3 of the third lens on the optical axis, and the air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5.

Further, the curvature radius R4 of the surface of the second lens facing the light-out side and the curvature radius R5 of the surface of the third lens facing the light-in side satisfy that: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0.

Further, an air interval T12 of the first lens and the second lens on the optical axis, and an air interval T23 of the second lens and the third lens on the optical axis satisfy: 1.0 < T12/T23 < 2.5.

Further, the center thickness CT5 of the fifth lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5.

Further, an on-axis distance SAG61 between an intersection point of a surface of the sixth lens facing the light incident side and the optical axis and an effective radius vertex of the surface of the sixth lens facing the light incident side and a center thickness CT6 of the sixth lens on the optical axis satisfies: -2.0 < SAG61/CT6 < -0.5.

Further, the Abbe number V2 of the second lens, the Abbe number V4 of the fourth lens and the Abbe number V6 of the sixth lens satisfy the following conditions: v2+ V4+ V6 < 60.

Further, the abbe number V1 of the first lens and the abbe number V3 of the third lens satisfy: v1+ V3 < 50.

According to another aspect of the present invention, there is provided an imaging lens group, comprising from a light incident side of the imaging lens group to a light exiting side of the imaging lens group: the surface of the first lens facing the light inlet side is a concave surface, and the surface of the first lens facing the light outlet side is a concave surface; a second lens having an optical power, the second lens having an Abbe number of less than 20; the surface of the third lens facing the light incidence side is a convex surface; the surface of the fourth lens facing the light incidence side is a concave surface; a fifth lens having optical power; a sixth lens having optical power; wherein the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0.

Further, the effective focal length f of the imaging lens group and the effective focal length f3 of the third lens satisfy: f3/f is more than 1.5 and less than 5.0.

Further, the curvature radius R3 of the surface of the second lens facing the light inlet side and the curvature radius R11 of the surface of the sixth lens facing the light inlet side satisfy that: -1.5 < R3/R11 < 0.5.

Further, the curvature radius R3 of the surface of the second lens facing the light inlet side and the curvature radius R12 of the surface of the sixth lens facing the light outlet side satisfy that: -0.5 < R3/R12 < 1.5.

Further, the radius of curvature R6 of the surface of the third lens facing the light-emitting side and the radius of curvature R10 of the surface of the fifth lens facing the light-emitting side satisfy: 1.5 < R6/R10 < 7.5.

Further, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0.

Further, the center thickness CT3 of the third lens on the optical axis, and the air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5.

Further, the curvature radius R4 of the surface of the second lens facing the light-out side and the curvature radius R5 of the surface of the third lens facing the light-in side satisfy that: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0.

Further, an air interval T12 of the first lens and the second lens on the optical axis, and an air interval T23 of the second lens and the third lens on the optical axis satisfy: 1.0 < T12/T23 < 2.5.

Further, the center thickness CT5 of the fifth lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5.

Further, an on-axis distance SAG61 between an intersection point of a surface of the sixth lens facing the light incident side and the optical axis and an effective radius vertex of the surface of the sixth lens facing the light incident side and a center thickness CT6 of the sixth lens on the optical axis satisfies: -2.0 < SAG61/CT6 < -0.5.

Further, the Abbe number V2 of the second lens, the Abbe number V4 of the fourth lens and the Abbe number V6 of the sixth lens satisfy the following conditions: v2+ V4+ V6 < 60.

Further, the abbe number V1 of the first lens and the abbe number V3 of the third lens satisfy: v1+ V3 < 50.

By applying the technical scheme of the invention, the light-in side of the imaging lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens to the light-out side of the imaging lens group, the first lens has negative focal power, the surface of the first lens facing the light-in side is a concave surface, and the surface of the first lens facing the light-out side is a concave surface; the second lens has focal power, and the Abbe number of the second lens is less than 20; the third lens has focal power, and the surface of the third lens facing the light incidence side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens facing the light incidence side is a concave surface; the fifth lens has focal power; the sixth lens has focal power; wherein the maximum field angle FOV of the imaging lens group satisfies: FOV > 80.

Through the positive and negative distribution of the focal power of each lens of the imaging lens group, the low-order aberration of the imaging lens group can be effectively balanced, meanwhile, the tolerance sensitivity of the imaging lens group can be reduced, and the imaging quality of the imaging lens group is ensured while the miniaturization of the imaging lens group is kept. By limiting the FOV within a reasonable range, the imaging lens group can still have a good imaging range under a certain volume. That is, the imaging lens group satisfies miniaturization while still having a good imaging range.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a configuration of an imaging lens group according to a first example of the present invention;

fig. 2 to 4 respectively show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens group in fig. 1;

fig. 5 is a schematic view showing a configuration of an imaging lens group according to a second example of the present invention;

fig. 6 to 8 show an on-axis chromatic aberration curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 5;

fig. 9 is a schematic view showing a structure of an imaging lens group of example three of the present invention;

fig. 10 to 12 show an on-axis chromatic aberration curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 9;

fig. 13 is a schematic view showing a structure of an imaging lens group of example four of the present invention;

fig. 14 to 16 show an on-axis chromatic aberration curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 13;

fig. 17 is a schematic view showing a structure of an imaging lens group of example five of the present invention;

fig. 18 to 20 show an on-axis chromatic aberration curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 17;

fig. 21 is a schematic view showing a structure of an imaging lens group of example six of the present invention;

fig. 22 to 24 show an on-axis chromatic aberration curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 21.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the surface of the first lens facing the light incidence side; s2, the surface of the first lens facing the light-emitting side; e2, second lens; s3, the surface of the second lens facing the light incidence side; s4, the surface of the second lens facing the light-emitting side; e3, third lens; s5, the surface of the third lens facing the light incidence side; s6, the surface of the third lens facing the light-emitting side; e4, fourth lens; s7, the surface of the fourth lens facing the light incidence side; s8, the surface of the fourth lens faces the light emitting side; e5, fifth lens; s9, the surface of the fifth lens facing the light incidence side; s10, the surface of the fifth lens facing the light-emitting side; e6, sixth lens; s11, the surface of the sixth lens facing the light incidence side; s12, the surface of the sixth lens facing the light-emitting side; e7 filter plate; s13, the surface of the filter plate facing to the light incident side; s14, the surface of the filter plate facing the light-emitting side; and S15, imaging surface.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. With respect to the surface facing the light incident side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; with respect to the surface facing the light outgoing side, a concave surface is determined when the R value is positive, and a convex surface is determined when the R value is negative.

The invention provides an imaging lens group, aiming at solving the problem that the imaging lens group in the prior art cannot give consideration to high image quality and miniaturization.

Example one

As shown in fig. 1 to 24, the light-incident side of the imaging lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the first lens has a negative focal power, a surface of the first lens facing the light-incident side is a concave surface, and a surface of the first lens facing the light-exit side is a concave surface; the second lens has focal power, and the Abbe number of the second lens is less than 20; the third lens has focal power, and the surface of the third lens facing the light incidence side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens facing the light incidence side is a concave surface; the fifth lens has focal power; the sixth lens has focal power; wherein the maximum field angle FOV of the imaging lens group satisfies: FOV > 80.

Through the positive and negative distribution of the focal power of each lens of the imaging lens group, the low-order aberration of the imaging lens group can be effectively balanced, meanwhile, the tolerance sensitivity of the imaging lens group can be reduced, and the imaging quality of the imaging lens group is ensured while the miniaturization of the imaging lens group is kept. By limiting the FOV within a reasonable range, the imaging lens group can still have a good imaging range under a certain volume. That is, the imaging lens group satisfies miniaturization while still having a good imaging range.

Preferably, the maximum field angle FOV of the imaging lens group satisfies: 85 < FOV < 120.

In the present embodiment, the effective focal length f of the imaging lens group and the effective focal length f3 of the third lens satisfy: f3/f is more than 1.5 and less than 5.0. The focal length of the third lens is reasonably controlled, the ghost image formed by the third lens can be controlled, and meanwhile, the sensitivity of the third lens can be reduced, so that the imaging quality of the imaging lens group is ensured. Preferably, 1.6 < f3/f < 5.0.

In the present embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0. By controlling f6/f5 within a reasonable range, better aberration balance of the imaging lens group is facilitated, resolution power of the imaging lens group is improved, and imaging quality of the imaging lens group is guaranteed. Preferably, -2.0 < f6/f5 < -1.2.

In the present embodiment, the radius of curvature R3 of the surface of the second lens facing the light incident side and the radius of curvature R11 of the surface of the sixth lens facing the light incident side satisfy: -1.5 < R3/R11 < 0.5. The ratio of the curvature radius of the surface of the second lens facing the light incident side to the curvature radius of the surface of the sixth lens facing the light incident side is limited in a certain range, which is beneficial to improving the stability of the assembly of the lenses. Preferably, -1.4 < R3/R11 < 0.2.

In the present embodiment, the radius of curvature R3 of the surface of the second lens facing the light-entering side and the radius of curvature R12 of the surface of the sixth lens facing the light-exiting side satisfy: -0.5 < R3/R12 < 1.5. The ratio of the curvature radius of the surface of the second lens facing the light inlet side to the curvature radius of the surface of the sixth lens facing the light outlet side is limited in a certain range, and the stability of lens assembly is improved. Preferably, -0.2 < R3/R12 < 1.3.

In the present embodiment, a radius of curvature R6 of the surface of the third lens facing the light-exit side and a radius of curvature R10 of the surface of the fifth lens facing the light-exit side satisfy: 1.5 < R6/R10 < 7.5. The ratio of the curvature radius of the surface of the third lens facing the light-emitting side to the curvature radius of the surface of the fifth lens facing the light-emitting side is limited in a certain range, and the stability of lens assembly is improved. Preferably, 1.6 < R6/R10 < 7.4.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0. The center thicknesses of the first lens and the second lens are reasonably distributed, so that the lenses are easy to perform injection molding, the processability of the imaging lens group is improved, and meanwhile, better imaging quality is guaranteed. Preferably, 1.0 < CT2/CT1 < 1.8.

In the present embodiment, the center thickness CT3 of the third lens on the optical axis, and the air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5. By controlling the central thickness of the third lens and the air space of the third lens and the fourth lens on the optical axis, the imaging lens group can have smaller curvature of field so as to ensure the imaging quality of the imaging lens group. Preferably, 1.6 < CT3/T34 < 5.4.

In the present embodiment, the radius of curvature R4 of the surface of the second lens facing the light exit side and the radius of curvature R5 of the surface of the third lens facing the light entrance side satisfy: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0. The ratio of the curvature radius of the surface of the second lens facing the light emitting side to the curvature radius of the surface of the third lens facing the light incident side is reasonably controlled within a reasonable range, so that the sensitivity of the imaging lens group is favorably reduced, and the imaging quality of the imaging lens group is ensured. Preferably, 1.0. ltoreq.R 4/R5 < 2.9.

In the present embodiment, the air interval T12 of the first lens and the second lens on the optical axis, and the air interval T23 of the second lens and the third lens on the optical axis satisfy: 1.0 < T12/T23 < 2.5. The air interval of the imaging lens group is reasonably distributed, the processing and assembling characteristics can be guaranteed, and the problem of interference of front and rear lenses in the assembling process due to the fact that the interval is too small is avoided. Meanwhile, the light deflection is favorably slowed down, the field curvature of the imaging lens group is adjusted, the sensitivity is reduced, and the better imaging quality is obtained. Preferably, 1.2 < T12/T23 < 2.3.

In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5. By controlling the central thickness of the fifth lens and the air interval of the fourth lens and the fifth lens on the optical axis within a reasonable range, the imaging lens group can better balance the chromatic aberration of the imaging lens group, and the distortion of the imaging lens group is effectively controlled. Preferably 6.4 < CT5/T45 < 11.

In the embodiment, the axial distance SAG61 between the intersection point of the surface of the sixth lens facing the light incidence side and the optical axis and the effective radius vertex of the surface of the sixth lens facing the light incidence side and the central thickness CT6 of the sixth lens on the optical axis satisfy: -2.0 < SAG61/CT6 < -0.5. By controlling the ratio of SAG61 to CT6 within a reasonable range, the sixth lens can be effectively prevented from being bent too much, the processing difficulty is reduced, and meanwhile, the assembly of the imaging lens group has higher stability. Preferably, -1.9 < SAG61/CT6 < -0.5.

In the present embodiment, the abbe number V2 of the second lens, the abbe number V4 of the fourth lens, and the abbe number V6 of the sixth lens satisfy: v2+ V4+ V6 < 60. By reducing the abbe numbers of the second lens, the fourth lens and the sixth lens, the chromatic aberration can be controlled within a reasonable range, so that the imaging quality of the imaging lens group is ensured. Preferably 50 < V2+ V4+ V6 < 60.

In the present embodiment, the abbe number V1 of the first lens and the abbe number V3 of the third lens satisfy: v1+ V3 < 50. The abbe numbers of the first lens and the second lens are controlled within a reasonable range, so that the chromatic aberration can be controlled within a reasonable range, and the imaging quality of the imaging lens group is ensured. Preferably, 40 < V1+ V3 < 50.

Example two

As shown in fig. 1 to 24, the light-incident side of the imaging lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the first lens has a negative focal power, a surface of the first lens facing the light-incident side is a concave surface, and a surface of the first lens facing the light-exit side is a concave surface; the second lens has focal power, and the Abbe number of the second lens is less than 20; the third lens has focal power, and the surface of the third lens facing the light incidence side is a convex surface; the fourth lens has negative focal power, and the surface of the fourth lens facing the light incidence side is a concave surface; the fifth lens has focal power; the sixth lens has focal power; wherein the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0.

Through the positive and negative distribution of the focal power of each lens of the imaging lens group, the low-order aberration of the imaging lens group can be effectively balanced, meanwhile, the tolerance sensitivity of the imaging lens group can be reduced, and the imaging quality of the imaging lens group is ensured while the miniaturization of the imaging lens group is kept. By controlling f6/f5 within a reasonable range, better aberration balance of the imaging lens group is facilitated, resolution power of the imaging lens group is improved, and imaging quality of the imaging lens group is guaranteed.

Preferably, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.2.

In the present embodiment, the effective focal length f of the imaging lens group and the effective focal length f3 of the third lens satisfy: f3/f is more than 1.5 and less than 5.0. The focal length of the third lens is reasonably controlled, the ghost image formed by the third lens can be controlled, and meanwhile, the sensitivity of the third lens can be reduced, so that the imaging quality of the imaging lens group is ensured. Preferably, 1.6 < f3/f < 5.0.

In the present embodiment, the radius of curvature R3 of the surface of the second lens facing the light incident side and the radius of curvature R11 of the surface of the sixth lens facing the light incident side satisfy: -1.5 < R3/R11 < 0.5. The ratio of the curvature radius of the surface of the second lens facing the light incident side to the curvature radius of the surface of the sixth lens facing the light incident side is limited in a certain range, which is beneficial to improving the stability of lens assembly. Preferably, -1.4 < R3/R11 < 0.2.

In the present embodiment, the radius of curvature R3 of the surface of the second lens facing the light-entering side and the radius of curvature R12 of the surface of the sixth lens facing the light-exiting side satisfy: -0.5 < R3/R12 < 1.5. The ratio of the curvature radius of the surface of the second lens facing the light inlet side to the curvature radius of the surface of the sixth lens facing the light outlet side is limited in a certain range, so that the stability of assembling of the lenses is improved. Preferably, -0.2 < R3/R12 < 1.3.

In the present embodiment, a radius of curvature R6 of the surface of the third lens facing the light-exit side and a radius of curvature R10 of the surface of the fifth lens facing the light-exit side satisfy: 1.5 < R6/R10 < 7.5. The ratio of the curvature radius of the surface of the third lens facing the light-emitting side to the curvature radius of the surface of the fifth lens facing the light-emitting side is limited in a certain range, and the stability of lens assembly is improved. Preferably, 1.6 < R6/R10 < 7.4.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0. The center thicknesses of the first lens and the second lens are reasonably distributed, so that the lenses are easy to perform injection molding, the processability of the imaging lens group is improved, and meanwhile, better imaging quality is guaranteed. Preferably, 1.0 < CT2/CT1 < 1.8.

In the present embodiment, the center thickness CT3 of the third lens on the optical axis, and the air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5. By controlling the central thickness of the third lens and the air space of the third lens and the fourth lens on the optical axis, the imaging lens group can have smaller curvature of field so as to ensure the imaging quality of the imaging lens group. Preferably, 1.6 < CT3/T34 < 5.4.

In the present embodiment, the radius of curvature R4 of the surface of the second lens facing the light exit side and the radius of curvature R5 of the surface of the third lens facing the light entrance side satisfy: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0. The ratio of the curvature radius of the surface of the second lens facing the light emitting side to the curvature radius of the surface of the third lens facing the light incident side is reasonably controlled within a reasonable range, so that the sensitivity of the imaging lens group is favorably reduced, and the imaging quality of the imaging lens group is ensured. Preferably, 1.0. ltoreq.R 4/R5 < 2.9.

In the present embodiment, the air interval T12 of the first lens and the second lens on the optical axis, and the air interval T23 of the second lens and the third lens on the optical axis satisfy: 1.0 < T12/T23 < 2.5. The air interval of the imaging lens group is reasonably distributed, the processing and assembling characteristics can be guaranteed, and the problem of interference of front and rear lenses in the assembling process due to the fact that the interval is too small is avoided. Meanwhile, the light deflection is favorably slowed down, the field curvature of the imaging lens group is adjusted, the sensitivity is reduced, and the better imaging quality is obtained. Preferably, 1.2 < T12/T23 < 2.3.

In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 6.3 < CT5/T45 < 11.5. By controlling the central thickness of the fifth lens and the air interval of the fourth lens and the fifth lens on the optical axis within a reasonable range, the imaging lens group can better balance the chromatic aberration of the imaging lens group, and the distortion of the imaging lens group is effectively controlled. Preferably 6.4 < CT5/T45 < 11.

In the embodiment, the axial distance SAG61 between the intersection point of the surface of the sixth lens facing the light incidence side and the optical axis and the effective radius vertex of the surface of the sixth lens facing the light incidence side and the central thickness CT6 of the sixth lens on the optical axis satisfy: -2.0 < SAG61/CT6 < -0.5. By controlling the ratio of SAG61 to CT6 within a reasonable range, the sixth lens can be effectively prevented from being bent too much, the processing difficulty is reduced, and meanwhile, the assembly of the imaging lens group has higher stability. Preferably, -1.9 < SAG61/CT6 < -0.5.

In the present embodiment, the abbe number V2 of the second lens, the abbe number V4 of the fourth lens, and the abbe number V6 of the sixth lens satisfy: v2+ V4+ V6 < 60. By reducing the abbe numbers of the second lens, the fourth lens and the sixth lens, the chromatic aberration can be controlled within a reasonable range, so that the imaging quality of the imaging lens group is ensured. Preferably 50 < V2+ V4+ V6 < 60.

In the present embodiment, the abbe number V1 of the first lens and the abbe number V3 of the third lens satisfy: v1+ V3 < 50. Through controlling the Abbe numbers of the first lens and the second lens within a reasonable range, the chromatic aberration can be controlled within a reasonable range, so that the imaging quality of the imaging lens group is ensured. Preferably, 40 < V1+ V3 < 50.

Optionally, the above-described imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.

The imaging lens group in the present application may employ a plurality of lenses, for example, the above-mentioned six lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the imaging lens group can be effectively increased, the sensitivity of the lens is reduced, and the machinability of the lens is improved, so that the imaging lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the claimed technical solution. For example, although six lenses are exemplified in the embodiment, the imaging lens group is not limited to including six lenses. The imaging lens group may also include other numbers of lenses, as desired.

Examples of specific surface types and parameters of the imaging lens group applicable to the above-described embodiments are further described below with reference to the drawings.

It should be noted that any one of the following examples one to six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 4, an imaging lens group of the first example of the present application is described. Fig. 1 shows a schematic diagram of an imaging lens group structure of example one.

As shown in fig. 1, the imaging lens assembly sequentially includes, from the light incident side to the light emergent side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens E1 has negative power, and the surface S1 of the first lens facing the light-in side is a concave surface, and the surface S2 of the first lens facing the light-out side is a concave surface. The second lens E2 has positive power, and has a convex surface S3 facing the light-in side and a concave surface S4 facing the light-out side. The third lens E3 has positive power, and the surface S5 of the third lens facing the light-in side is convex, and the surface S6 of the third lens facing the light-out side is convex. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is convex, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 1.30mm, the total length TTL of the imaging lens group is 6.50mm and the image height ImgH is 2.29 mm.

Table 1 shows a basic structural parameter table of the imaging lens group of example one, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 1

In the first example, a surface facing the light incident side and a surface facing the light exiting side of any one of the first lens E1 to the sixth lens E6 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S12 in example one.

TABLE 2

Fig. 2 shows on-axis chromatic aberration curves of the imaging lens group of example one, which represent convergent focus deviations of light rays of different wavelengths after passing through the imaging lens group. Fig. 3 shows distortion curves of the imaging lens group of example one, which indicate distortion magnitude values corresponding to different angles of view. Fig. 4 shows a chromatic aberration of magnification curve of the imaging lens group of the first example, which represents a deviation of different image heights of light rays on an imaging surface after passing through the imaging lens group.

As can be seen from fig. 2 to 4, the imaging lens group given in example one can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, an imaging lens group of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 5 shows a schematic diagram of an imaging lens group structure of example two.

As shown in fig. 5, the imaging lens group sequentially includes, from the light incident side to the light exit side, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

The first lens E1 has negative power, and the surface S1 of the first lens facing the light-in side is a concave surface, and the surface S2 of the first lens facing the light-out side is a concave surface. The second lens E2 has positive power, and has a convex surface S3 facing the light-in side and a concave surface S4 facing the light-out side. The third lens E3 has positive power, and the surface S5 of the third lens facing the light-in side is convex, and the surface S6 of the third lens facing the light-out side is convex. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is convex, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light entrance side is concave, and its surface S12 facing the light exit side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 1.30mm, the total length TTL of the imaging lens group is 6.50mm and the image height ImgH is 2.60 mm.

Table 3 shows a basic structural parameter table of the imaging lens group of example two, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 4

Fig. 6 shows on-axis chromatic aberration curves of the imaging lens group of example two, which represent the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens group. Fig. 7 shows distortion curves of the imaging lens group of example two, which represent distortion magnitude values corresponding to different angles of view. Fig. 8 shows a chromatic aberration of magnification curve of the imaging lens group of the second example, which represents a deviation of different image heights on the imaging surface after light passes through the imaging lens group.

As can be seen from fig. 6 to 8, the imaging lens group given in example two can achieve good imaging quality.

Example III

As shown in fig. 9 to 12, an imaging lens group of example three of the present application is described. Fig. 9 shows a schematic diagram of an imaging lens group structure of example three.

As shown in fig. 9, the imaging lens group sequentially includes, from the light incident side to the light exit side, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

The first lens E1 has negative power, and the surface S1 of the first lens facing the light-in side is a concave surface, and the surface S2 of the first lens facing the light-out side is a concave surface. The second lens E2 has positive power, and has a convex surface S3 facing the light-in side and a concave surface S4 facing the light-out side. The third lens E3 has positive power, and its surface S5 facing the light-in side is convex, and its surface S6 facing the light-out side is concave. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is convex, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is convex, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light entrance side is concave, and its surface S12 facing the light exit side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 1.30mm, the total length TTL of the imaging lens group is 6.50mm and the image height ImgH is 2.60 mm.

Table 5 shows a basic structural parameter table of the imaging lens group of example three, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.5247E+00

-5.6658E-01

1.8871E-01

-6.6979E-02

2.8151E-02

-1.2562E-02

5.8431E-03

S2

7.7884E-01

-2.0594E-01

3.5679E-02

-3.6572E-03

6.1862E-04

1.4442E-04

-4.8064E-04

S3

3.3893E-02

-2.0789E-02

4.0079E-03

5.6853E-04

1.2248E-04

-5.0157E-05

-2.5821E-05

S4

1.6108E-02

3.2454E-03

1.5828E-03

1.2936E-04

1.4777E-04

2.5562E-05

5.9117E-05

S5

1.4569E-03

1.0989E-03

-2.2138E-03

1.0394E-03

-2.7670E-04

-4.6353E-04

3.7763E-04

S6

-4.3384E-02

-1.3829E-03

1.3461E-03

-1.6522E-03

2.2201E-05

6.1770E-04

1.6521E-04

S7

-1.2667E-01

-1.0391E-02

4.8831E-03

1.0554E-03

-1.2599E-03

2.1276E-04

5.8987E-04

S8

-1.0181E-01

-2.2669E-02

-2.7144E-03

3.5338E-03

-8.3725E-04

3.7984E-04

-8.8400E-04

S9

-1.8532E-01

2.6076E-02

-2.1287E-02

6.1631E-03

1.2696E-03

3.0483E-03

-1.8398E-04

S10

1.6731E-01

2.3038E-01

-2.8846E-02

-3.4641E-02

2.6729E-02

1.1359E-02

5.3740E-03

S11

-1.3892E+00

4.8909E-04

1.8741E-02

7.3875E-02

-1.5614E-02

-9.4411E-03

2.9506E-02

S12

-2.5204E+00

2.0355E-01

-2.8580E-01

7.9250E-02

4.8657E-02

1.0396E-02

-3.4877E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.6372E-03

1.1313E-03

-5.1909E-04

2.6814E-04

-1.3643E-04

5.3819E-05

-9.8482E-06

S2

5.3400E-04

-3.4075E-04

1.1021E-04

-1.1786E-05

-1.5514E-06

-3.1238E-07

2.6975E-07

S3

1.6496E-06

-1.2544E-05

3.3200E-05

-1.9176E-05

1.9943E-06

1.6561E-06

-4.2223E-07

S4

1.0442E-05

1.3067E-05

-2.7535E-06

3.5749E-06

-6.6254E-06

5.6809E-07

-3.3779E-06

S5

1.6287E-04

-3.0489E-04

-3.5863E-05

2.0093E-04

5.3106E-05

-6.6905E-05

-3.2246E-05

S6

-2.7145E-04

-1.8358E-04

1.3778E-05

7.8956E-05

2.7843E-05

-5.8128E-06

-8.2692E-06

S7

4.1644E-05

-3.3553E-04

-2.4524E-04

-1.0574E-05

1.0115E-04

7.3383E-05

2.7372E-05

S8

2.4958E-05

5.2686E-04

2.2911E-05

-2.7959E-04

-3.1895E-04

-1.3097E-04

-2.6503E-05

S9

2.2779E-04

3.1671E-04

3.9954E-04

4.2083E-04

1.2921E-04

5.3308E-05

-1.4969E-05

S10

8.5718E-04

2.6184E-03

-2.3132E-03

6.2030E-04

-1.9499E-03

-2.2153E-03

-1.2324E-03

S11

1.1007E-02

-2.9638E-03

-7.1583E-03

3.8203E-03

2.6332E-03

2.3429E-03

9.2322E-04

S12

2.3413E-03

1.5745E-02

-1.3370E-03

8.4367E-03

1.8625E-03

-9.0176E-03

-1.0070E-02

TABLE 6

Fig. 10 shows on-axis chromatic aberration curves of the imaging lens group of example three, which represent convergent focus deviations of light rays of different wavelengths after passing through the imaging lens group. Fig. 11 shows distortion curves of the imaging lens group of example three, which represent distortion magnitude values corresponding to different angles of view. Fig. 12 shows a chromatic aberration of magnification curve of an imaging lens group of example three, which represents a deviation of different image heights on an imaging surface after light passes through the imaging lens group.

As can be seen from fig. 10 to 12, the imaging lens group given in example three can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, an imaging lens group of the present example four is described. Fig. 13 shows a schematic diagram of an imaging lens group structure of example four.

As shown in fig. 13, the imaging lens group sequentially includes, from the light incident side to the light exit side, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

The first lens E1 has negative power, and the surface S1 of the first lens facing the light-in side is a concave surface, and the surface S2 of the first lens facing the light-out side is a concave surface. The second lens E2 has positive power, and has a convex surface S3 facing the light-in side and a concave surface S4 facing the light-out side. The third lens E3 has positive power, and the surface S5 of the third lens facing the light-in side is convex, and the surface S6 of the third lens facing the light-out side is convex. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is convex. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is convex, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light entrance side is concave, and its surface S12 facing the light exit side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 1.30mm, the total length TTL of the imaging lens group is 6.50mm and the image height ImgH is 2.60 mm.

Table 7 shows a basic structural parameter table of the imaging lens group of example four, in which the units of the radius of curvature, thickness/distance, focal length are all millimeters (mm).

TABLE 7

Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.5256E+00

-5.6850E-01

1.8853E-01

-6.6518E-02

2.7904E-02

-1.2620E-02

5.7887E-03

S2

7.7038E-01

-2.0567E-01

3.6161E-02

-3.7735E-03

6.6331E-04

1.7213E-04

-4.8379E-04

S3

4.4788E-02

-1.9862E-02

3.7339E-03

3.1425E-04

1.6947E-04

-1.2985E-04

-5.7718E-05

S4

1.3988E-02

1.4738E-03

8.6939E-04

2.6840E-05

1.7875E-04

-2.1383E-05

-3.4461E-05

S5

-9.9973E-03

-1.4236E-03

2.2966E-04

-2.3282E-04

-1.1809E-04

4.2191E-05

4.4055E-05

S6

-1.1654E-01

-8.0532E-03

3.6125E-03

-1.0984E-03

-7.6665E-04

2.8481E-04

3.4684E-04

S7

-1.4418E-01

-1.6961E-02

7.5892E-03

-1.0798E-03

-1.0220E-03

1.2761E-03

4.9851E-04

S8

-5.1275E-02

-3.4993E-02

-5.2255E-03

3.7671E-03

-1.0807E-03

3.8081E-04

-3.8803E-04

S9

-1.7883E-01

4.1592E-02

-2.7769E-02

1.2898E-02

-6.8382E-04

2.7016E-03

6.5304E-04

S10

1.5552E-01

1.0187E-01

-9.1867E-04

-1.3337E-02

3.5855E-03

1.2562E-02

1.2664E-02

S11

-1.7353E+00

-5.5345E-02

5.3826E-02

7.9340E-02

-4.0681E-02

8.4752E-03

2.5054E-02

S12

-2.1626E+00

1.1489E-02

-2.3491E-01

7.8124E-02

5.0906E-03

2.1681E-02

-1.6768E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.6572E-03

1.1069E-03

-4.7084E-04

2.5743E-04

-1.2769E-04

4.9701E-05

-9.9040E-06

S2

5.2364E-04

-3.5491E-04

1.0740E-04

-9.4404E-06

-6.7449E-07

-1.0445E-07

7.3018E-08

S3

-2.5019E-05

-3.5757E-06

3.8468E-05

-2.9794E-06

-7.5261E-06

3.0331E-06

-5.1181E-07

S4

-1.6113E-04

-1.4299E-04

-1.3763E-04

-6.8260E-05

-5.3252E-05

-1.7049E-05

-1.0106E-05

S5

6.3709E-08

-9.8330E-06

-1.0692E-05

-5.5079E-06

3.0618E-06

5.7996E-06

3.4777E-06

S6

-4.2703E-05

-9.3462E-05

-1.8020E-05

2.6970E-05

1.4996E-06

-3.1768E-06

-8.8156E-06

S7

-6.7880E-04

-4.0194E-04

1.7287E-04

2.5526E-04

1.9209E-05

-5.9707E-05

-1.8920E-05

S8

8.3865E-04

-1.4770E-04

-1.8149E-04

4.5929E-04

-5.6538E-05

-4.4575E-04

-3.4336E-04

S9

4.7535E-04

-2.0042E-04

6.4967E-06

2.8546E-04

6.5314E-05

8.9400E-05

-5.7113E-05

S10

-9.9295E-04

-6.0547E-03

-3.4839E-04

4.7011E-03

-3.2238E-03

-6.0207E-03

-2.7734E-03

S11

8.1691E-03

-7.2947E-03

-1.1437E-03

3.9797E-03

-1.1512E-04

1.5711E-03

8.4883E-04

S12

-7.4976E-03

3.0283E-03

1.4740E-02

7.1792E-03

-4.0799E-03

-9.2594E-03

-6.7150E-03

TABLE 8

Fig. 14 shows on-axis chromatic aberration curves of the imaging lens group of example four, which represent convergent focus deviations of light rays of different wavelengths after passing through the imaging lens group. Fig. 15 shows distortion curves of the imaging lens group of example four, which represent distortion magnitude values corresponding to different angles of view. Fig. 16 shows a chromatic aberration of magnification curve of the imaging lens group of example four, which represents a deviation of different image heights on the imaging surface after light passes through the imaging lens group.

As can be seen from fig. 14 to 16, the imaging lens group given in example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, an imaging lens group of example five of the present application is described. Fig. 17 shows a schematic diagram of an imaging lens group structure of example five.

As shown in fig. 17, the imaging lens group sequentially includes, from the light incident side to the light exit side, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

The first lens E1 has negative power, and the surface S1 of the first lens facing the light-in side is a concave surface, and the surface S2 of the first lens facing the light-out side is a concave surface. The second lens E2 has positive power, and has a convex surface S3 facing the light-in side and a concave surface S4 facing the light-out side. The third lens E3 has positive power, and the surface S5 of the third lens facing the light-in side is convex, and the surface S6 of the third lens facing the light-out side is convex. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is convex, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light entrance side is concave, and its surface S12 facing the light exit side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 1.30mm, the total length TTL of the imaging lens group is 6.50mm and the image height ImgH is 2.60 mm.

Table 9 shows a basic structural parameter table of the imaging lens group of example five, in which the units of the radius of curvature, thickness/distance, and focal length are millimeters (mm).

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.5078E+00

-5.6359E-01

1.8916E-01

-6.7505E-02

2.8015E-02

-1.2493E-02

5.8070E-03

S2

8.0282E-01

-2.0569E-01

3.5897E-02

-3.5485E-03

6.5459E-04

1.8487E-04

-4.7379E-04

S3

4.5696E-02

-2.0798E-02

3.5452E-03

8.7188E-04

2.7149E-04

-1.2510E-04

-1.7376E-05

S4

1.1314E-02

2.0370E-03

9.7077E-04

-2.4139E-04

-2.5965E-04

-1.9355E-04

-4.7700E-05

S5

-1.3054E-02

-1.3516E-03

1.9559E-04

-6.6211E-05

-1.9499E-04

-5.0683E-06

7.3868E-05

S6

-1.2808E-01

-3.3123E-03

1.0530E-03

-5.2928E-04

-6.0940E-04

1.3919E-04

3.1938E-04

S7

-2.3212E-01

-4.7498E-03

3.2674E-03

-5.0467E-04

-1.2969E-03

5.7341E-04

9.1864E-04

S8

-9.8620E-02

-2.5100E-02

1.9647E-03

1.2746E-03

4.3131E-04

2.6419E-04

-1.1360E-04

S9

-3.7739E-02

-1.1732E-01

1.2644E-02

1.2189E-03

2.7532E-03

8.8780E-04

1.1894E-03

S10

-8.2617E-02

3.4962E-02

1.6577E-01

-1.0612E-01

1.7267E-02

2.1376E-02

2.4477E-02

S11

-2.3698E+00

-3.2989E-01

2.8051E-01

2.3560E-02

-4.2127E-02

-1.2514E-02

5.3367E-02

S12

-1.7458E+00

2.5668E-01

-2.7788E-01

1.9803E-02

5.2298E-02

6.0997E-03

-2.8024E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.6461E-03

1.1184E-03

-5.0226E-04

2.5405E-04

-1.2603E-04

4.7751E-05

-8.8084E-06

S2

5.2941E-04

-3.5310E-04

1.0875E-04

-8.8405E-06

-6.2685E-07

-2.6494E-07

-1.1941E-07

S3

-1.7954E-05

-4.7700E-06

2.4775E-05

-7.0704E-06

-8.9320E-06

5.5563E-06

-9.9772E-07

S4

-3.4262E-05

1.0124E-05

-6.4174E-06

3.4582E-06

-1.2828E-05

-2.5218E-06

-7.0116E-06

S5

3.0587E-05

-2.1956E-05

-2.8009E-05

-6.0176E-06

8.2952E-06

8.9189E-06

2.7994E-06

S6

-1.8563E-05

-1.0059E-04

-4.3392E-05

2.2403E-05

1.0043E-05

-4.1954E-06

-9.1508E-06

S7

-1.0248E-04

-5.1482E-04

-2.6037E-04

5.9540E-05

1.2400E-04

6.6836E-05

1.8978E-05

S8

1.1433E-04

2.0965E-04

-2.0259E-04

-3.0699E-05

-7.3298E-05

-2.3158E-05

-5.8222E-05

S9

2.9365E-04

-6.8921E-04

3.0588E-04

1.2467E-03

3.5362E-04

-3.1048E-04

-4.1343E-04

S10

-1.8031E-02

-4.4831E-05

3.8651E-03

3.4438E-03

-9.3578E-03

-8.8972E-03

-4.0340E-03

S11

5.4496E-03

-1.0524E-02

-7.1457E-03

1.1591E-02

4.9637E-03

-1.1876E-03

-2.3408E-03

S12

-5.6137E-03

1.7569E-02

2.6472E-03

-4.2613E-03

-3.1048E-03

3.2096E-03

2.1291E-04

Watch 10

Fig. 18 shows an on-axis chromatic aberration curve of an imaging lens group of example five, which represents a convergent focus deviation of light rays of different wavelengths after passing through the imaging lens group. Fig. 19 shows distortion curves of the imaging lens group of example five, which represent distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the imaging lens group of example five, which represents deviation of different image heights on the imaging surface after light passes through the imaging lens group.

As can be seen from fig. 18 to 20, the imaging lens group given in example five can achieve good imaging quality.

Example six

As shown in fig. 21 to 24, an imaging lens group of example six of the present application is described. Fig. 21 shows a schematic diagram of an imaging lens group structure of example six.

As shown in fig. 21, the imaging lens group sequentially includes, from the light incident side to the light exit side, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

The first lens E1 has negative power, and the surface S1 of the first lens facing the light-in side is a concave surface, and the surface S2 of the first lens facing the light-out side is a concave surface. The second lens E2 has positive power, and has a convex surface S3 facing the light-in side and a concave surface S4 facing the light-out side. The third lens E3 has positive power, and the surface S5 of the third lens facing the light-in side is convex, and the surface S6 of the third lens facing the light-out side is convex. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive power, and the surface S9 of the fifth lens facing the light-in side is convex, and the surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light entrance side is concave, and its surface S12 facing the light exit side is convex. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 1.30mm, the total length TTL of the imaging lens group is 6.50mm and the image height ImgH is 2.60 mm.

Table 11 shows a basic structural parameter table of the imaging lens group of example six, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 12

Fig. 22 shows an on-axis chromatic aberration curve of an imaging lens group of example six, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging lens group. Fig. 23 shows distortion curves of the imaging lens group of example six, which represent distortion magnitude values corresponding to different angles of view. Fig. 24 shows a chromatic aberration of magnification curve of the imaging lens group of example six, which represents deviation of different image heights on the imaging surface of light after passing through the imaging lens group.

As can be seen from fig. 22 to 24, the imaging lens group given in example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Conditions/examples	1	2	3	4	5	6
							FOV	95.0	91.8	91.2	90.3	90.4	89.6
f3/f	1.89	1.74	4.99	2.34	2.25	1.96
							f6/f5	-1.83	-1.61	-1.99	-1.80	-1.43	-1.96
R3/R11	0.02	-0.69	-0.07	-0.51	-1.39	-1.34
							R3/R12	1.05	0.88	1.04	0.79	0.63	-0.08
R6/R10	1.79	2.55	3.86	5.11	7.19	3.57
							CT2/CT1	1.07	1.35	1.39	1.40	1.54	1.20
R4/R5	1.06	1.28	2.77	1.93	2.26	1.84
							T12/T23	2.04	1.40	1.47	1.22	1.49	1.27
CT3/T34	5.00	4.44	1.75	2.46	2.72	5.24
							CT5/T45	6.43	10.61	10.59	10.59	9.78	7.88
SAG61/CT6	-1.74	-0.67	-0.71	-0.74	-0.51	-0.87
							V2+V4+V6	57.60	57.60	57.60	57.60	57.60	57.60
V1+V3	47.00	47.00	47.00	47.00	47.00	47.00

Watch 13

Table 14 gives effective focal lengths f of the imaging lens groups of example one to example six, and effective focal lengths f1 to f6 of the respective lenses.

TABLE 14

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens group described above.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An imaging lens assembly, comprising, from a light incident side of the imaging lens assembly to a light exiting side of the imaging lens assembly:

the surface of the first lens facing the light inlet side is a concave surface, and the surface of the first lens facing the light outlet side is a concave surface;

a second lens having an optical power, the second lens having an Abbe number less than 20;

the surface of the third lens facing to the light incidence side is a convex surface;

the surface of the fourth lens facing the light incidence side is a concave surface;

a fifth lens having optical power;

a sixth lens having optical power;

wherein a maximum field angle FOV of the imaging lens group satisfies: FOV > 80.

2. The imaging lens group according to claim 1, wherein an effective focal length f of the imaging lens group and an effective focal length f3 of the third lens satisfy: f3/f is more than 1.5 and less than 5.0.

3. The imaging lens group of claim 1, wherein an effective focal length f5 of the fifth lens and an effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0.

4. The imaging lens group of claim 1, wherein a radius of curvature R3 of a surface of the second lens facing the light incident side and a radius of curvature R11 of a surface of the sixth lens facing the light incident side satisfy: -1.5 < R3/R11 < 0.5.

5. The imaging lens group of claim 1, wherein a radius of curvature R3 of a surface of the second lens facing the light incident side and a radius of curvature R12 of a surface of the sixth lens facing the light exiting side satisfy: -0.5 < R3/R12 < 1.5.

6. The imaging lens group of claim 1, wherein a radius of curvature R6 of a surface of the third lens facing the light exit side and a radius of curvature R10 of a surface of the fifth lens facing the light exit side satisfy: 1.5 < R6/R10 < 7.5.

7. The imaging lens group of claim 1 wherein a center thickness CT1 of the first lens on an optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT2/CT1 < 2.0.

8. The imaging lens group of claim 1 wherein the central thickness CT3 of the third lens on the optical axis, the air spacing T34 of the third lens and the fourth lens on the optical axis satisfy: 1.5 < CT3/T34 < 5.5.

9. The imaging lens group of claim 1, wherein a radius of curvature R4 of a surface of the second lens facing the light exit side and a radius of curvature R5 of a surface of the third lens facing the light entrance side satisfy: R4/R5 is more than or equal to 1.0 and less than or equal to 3.0.

10. An imaging lens assembly, comprising, from a light incident side of the imaging lens assembly to a light exiting side of the imaging lens assembly:

the surface of the first lens facing the light inlet side is a concave surface, and the surface of the first lens facing the light outlet side is a concave surface;

a second lens having an optical power, the second lens having an Abbe number less than 20;

the surface of the third lens facing to the light incidence side is a convex surface;

the surface of the fourth lens facing the light incidence side is a concave surface;

a fifth lens having optical power;

a sixth lens having optical power;

wherein an effective focal length f5 of the fifth lens and an effective focal length f6 of the sixth lens satisfy: -2.0 < f6/f5 < -1.0.

Images